American Journal of Preventive Medicine
American Journal of Preventive Medicine > 1998 > 15 > 2 > 134-138
American Journal of Preventive Medicine > 2000 > 19 > 4 > 238-244
American Journal of Preventive Medicine > 1998 > 15 > 2 > 134-138
American Journal of Preventive Medicine > 2000 > 19 > 4 > 238-244